2006-03-27 02:16:37 -07:00
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/*
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* RTC subsystem, interface functions
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*
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* Copyright (C) 2005 Tower Technologies
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* Author: Alessandro Zummo <a.zummo@towertech.it>
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*
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* based on arch/arm/common/rtctime.c
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/rtc.h>
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2007-05-08 00:33:30 -07:00
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int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm)
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2006-03-27 02:16:37 -07:00
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{
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int err;
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->read_time)
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err = -EINVAL;
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else {
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memset(tm, 0, sizeof(struct rtc_time));
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->read_time(rtc->dev.parent, tm);
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2006-03-27 02:16:37 -07:00
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}
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_time);
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2007-05-08 00:33:30 -07:00
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int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm)
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2006-03-27 02:16:37 -07:00
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{
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int err;
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err = rtc_valid_tm(tm);
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if (err != 0)
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return err;
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->set_time)
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err = -EINVAL;
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else
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->set_time(rtc->dev.parent, tm);
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2006-03-27 02:16:37 -07:00
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_time);
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2007-05-08 00:33:30 -07:00
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int rtc_set_mmss(struct rtc_device *rtc, unsigned long secs)
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2006-03-27 02:16:37 -07:00
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{
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int err;
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (rtc->ops->set_mmss)
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->set_mmss(rtc->dev.parent, secs);
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2006-03-27 02:16:37 -07:00
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else if (rtc->ops->read_time && rtc->ops->set_time) {
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struct rtc_time new, old;
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->read_time(rtc->dev.parent, &old);
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2006-03-27 02:16:37 -07:00
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if (err == 0) {
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rtc_time_to_tm(secs, &new);
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/*
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* avoid writing when we're going to change the day of
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* the month. We will retry in the next minute. This
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* basically means that if the RTC must not drift
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* by more than 1 minute in 11 minutes.
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*/
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if (!((old.tm_hour == 23 && old.tm_min == 59) ||
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(new.tm_hour == 23 && new.tm_min == 59)))
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->set_time(rtc->dev.parent,
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2007-05-08 00:33:30 -07:00
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&new);
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2006-03-27 02:16:37 -07:00
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}
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}
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else
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err = -EINVAL;
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_mmss);
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2007-05-08 00:33:30 -07:00
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int rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
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2006-03-27 02:16:37 -07:00
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{
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int err;
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (rtc->ops == NULL)
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err = -ENODEV;
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else if (!rtc->ops->read_alarm)
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err = -EINVAL;
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else {
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memset(alarm, 0, sizeof(struct rtc_wkalrm));
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->read_alarm(rtc->dev.parent, alarm);
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2006-03-27 02:16:37 -07:00
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}
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_read_alarm);
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2007-05-08 00:33:30 -07:00
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int rtc_set_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
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2006-03-27 02:16:37 -07:00
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{
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int err;
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2007-05-08 00:34:07 -07:00
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err = rtc_valid_tm(&alarm->time);
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if (err != 0)
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return err;
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2006-03-27 02:16:37 -07:00
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err = mutex_lock_interruptible(&rtc->ops_lock);
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if (err)
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return -EBUSY;
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if (!rtc->ops)
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err = -ENODEV;
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else if (!rtc->ops->set_alarm)
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err = -EINVAL;
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else
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->set_alarm(rtc->dev.parent, alarm);
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2006-03-27 02:16:37 -07:00
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mutex_unlock(&rtc->ops_lock);
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_set_alarm);
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2006-11-25 12:09:28 -07:00
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/**
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* rtc_update_irq - report RTC periodic, alarm, and/or update irqs
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2007-05-08 00:33:30 -07:00
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* @rtc: the rtc device
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2006-11-25 12:09:28 -07:00
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* @num: how many irqs are being reported (usually one)
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* @events: mask of RTC_IRQF with one or more of RTC_PF, RTC_AF, RTC_UF
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* Context: in_interrupt(), irqs blocked
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*/
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2007-05-08 00:33:30 -07:00
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void rtc_update_irq(struct rtc_device *rtc,
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2006-03-27 02:16:37 -07:00
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unsigned long num, unsigned long events)
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{
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spin_lock(&rtc->irq_lock);
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rtc->irq_data = (rtc->irq_data + (num << 8)) | events;
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spin_unlock(&rtc->irq_lock);
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spin_lock(&rtc->irq_task_lock);
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if (rtc->irq_task)
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rtc->irq_task->func(rtc->irq_task->private_data);
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spin_unlock(&rtc->irq_task_lock);
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wake_up_interruptible(&rtc->irq_queue);
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kill_fasync(&rtc->async_queue, SIGIO, POLL_IN);
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}
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EXPORT_SYMBOL_GPL(rtc_update_irq);
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2007-05-08 00:33:30 -07:00
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struct rtc_device *rtc_class_open(char *name)
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2006-03-27 02:16:37 -07:00
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{
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2007-05-08 00:33:40 -07:00
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struct device *dev;
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2007-05-08 00:33:30 -07:00
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struct rtc_device *rtc = NULL;
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2006-03-27 02:16:37 -07:00
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down(&rtc_class->sem);
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2007-05-08 00:33:40 -07:00
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list_for_each_entry(dev, &rtc_class->devices, node) {
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if (strncmp(dev->bus_id, name, BUS_ID_SIZE) == 0) {
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dev = get_device(dev);
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if (dev)
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rtc = to_rtc_device(dev);
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2006-03-27 02:16:37 -07:00
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break;
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}
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}
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2007-05-08 00:33:30 -07:00
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if (rtc) {
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if (!try_module_get(rtc->owner)) {
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2007-05-08 00:33:40 -07:00
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put_device(dev);
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2007-05-08 00:33:30 -07:00
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rtc = NULL;
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}
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2006-03-27 02:16:37 -07:00
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}
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up(&rtc_class->sem);
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2007-05-08 00:33:30 -07:00
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return rtc;
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2006-03-27 02:16:37 -07:00
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}
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EXPORT_SYMBOL_GPL(rtc_class_open);
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2007-05-08 00:33:30 -07:00
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void rtc_class_close(struct rtc_device *rtc)
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2006-03-27 02:16:37 -07:00
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{
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2007-05-08 00:33:30 -07:00
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module_put(rtc->owner);
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2007-05-08 00:33:40 -07:00
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put_device(&rtc->dev);
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2006-03-27 02:16:37 -07:00
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}
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EXPORT_SYMBOL_GPL(rtc_class_close);
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2007-05-08 00:33:30 -07:00
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int rtc_irq_register(struct rtc_device *rtc, struct rtc_task *task)
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2006-03-27 02:16:37 -07:00
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{
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int retval = -EBUSY;
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if (task == NULL || task->func == NULL)
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return -EINVAL;
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2007-10-16 01:28:15 -07:00
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/* Cannot register while the char dev is in use */
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if (!(mutex_trylock(&rtc->char_lock)))
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return -EBUSY;
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2006-11-25 12:09:28 -07:00
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spin_lock_irq(&rtc->irq_task_lock);
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2006-03-27 02:16:37 -07:00
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if (rtc->irq_task == NULL) {
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rtc->irq_task = task;
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retval = 0;
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}
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2006-11-25 12:09:28 -07:00
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spin_unlock_irq(&rtc->irq_task_lock);
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2006-03-27 02:16:37 -07:00
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2007-10-16 01:28:15 -07:00
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mutex_unlock(&rtc->char_lock);
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2006-03-27 02:16:37 -07:00
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return retval;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_register);
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2007-05-08 00:33:30 -07:00
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void rtc_irq_unregister(struct rtc_device *rtc, struct rtc_task *task)
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2006-03-27 02:16:37 -07:00
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{
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2006-11-25 12:09:28 -07:00
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spin_lock_irq(&rtc->irq_task_lock);
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2006-03-27 02:16:37 -07:00
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if (rtc->irq_task == task)
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rtc->irq_task = NULL;
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2006-11-25 12:09:28 -07:00
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spin_unlock_irq(&rtc->irq_task_lock);
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2006-03-27 02:16:37 -07:00
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}
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EXPORT_SYMBOL_GPL(rtc_irq_unregister);
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2007-05-08 00:33:30 -07:00
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int rtc_irq_set_state(struct rtc_device *rtc, struct rtc_task *task, int enabled)
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2006-03-27 02:16:37 -07:00
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{
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int err = 0;
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unsigned long flags;
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2006-06-25 05:48:20 -07:00
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if (rtc->ops->irq_set_state == NULL)
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return -ENXIO;
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2006-03-27 02:16:37 -07:00
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spin_lock_irqsave(&rtc->irq_task_lock, flags);
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2007-10-16 01:28:15 -07:00
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if (rtc->irq_task != NULL && task == NULL)
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err = -EBUSY;
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2006-03-27 02:16:37 -07:00
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if (rtc->irq_task != task)
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2007-10-16 01:28:15 -07:00
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err = -EACCES;
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2006-03-27 02:16:37 -07:00
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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if (err == 0)
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->irq_set_state(rtc->dev.parent, enabled);
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2006-03-27 02:16:37 -07:00
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return err;
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}
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EXPORT_SYMBOL_GPL(rtc_irq_set_state);
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2007-05-08 00:33:30 -07:00
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int rtc_irq_set_freq(struct rtc_device *rtc, struct rtc_task *task, int freq)
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2006-03-27 02:16:37 -07:00
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{
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2006-06-25 05:48:20 -07:00
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int err = 0;
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2006-03-27 02:16:37 -07:00
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unsigned long flags;
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2006-06-25 05:48:20 -07:00
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if (rtc->ops->irq_set_freq == NULL)
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return -ENXIO;
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2006-03-27 02:16:37 -07:00
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spin_lock_irqsave(&rtc->irq_task_lock, flags);
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2007-10-16 01:28:15 -07:00
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if (rtc->irq_task != NULL && task == NULL)
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err = -EBUSY;
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2006-03-27 02:16:37 -07:00
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if (rtc->irq_task != task)
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2007-10-16 01:28:15 -07:00
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err = -EACCES;
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2006-03-27 02:16:37 -07:00
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spin_unlock_irqrestore(&rtc->irq_task_lock, flags);
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if (err == 0) {
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2007-05-08 00:33:40 -07:00
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err = rtc->ops->irq_set_freq(rtc->dev.parent, freq);
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2006-03-27 02:16:37 -07:00
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if (err == 0)
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rtc->irq_freq = freq;
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}
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return err;
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}
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2006-11-25 12:09:27 -07:00
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EXPORT_SYMBOL_GPL(rtc_irq_set_freq);
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